Gas Venting Disk Geometry for Higher Battery Pack Discharge Flow
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Solution Overview
Problem
Conventional gas venting devices for battery packs have limitations in discharging a large flow rate of gas due to their simple cylindrical structure, which restricts the pressure difference between the inlet and outlet, leading to safety concerns when gas is generated inside the battery pack.
Innovation Solution
A gas venting device with a bracket and a venting disk that includes a through hole with a gas discharge flow path with a continuously or gradually reduced cross-sectional area, enhancing the pressure difference between the inlet and outlet to increase the discharge flow rate, featuring a truncated conical shape and varying incline surfaces to manage flow instability and pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a simple cylindrical structure is used for the gas discharge flow path, then the device complexity is reduced, but the gas discharge flow rate is limited due to insufficient pressure difference between inlet and outlet
Solution Approach 1:
The gas discharge flow path is designed with a curved inner wall surface that gradually reduces in cross-sectional area from inlet to outlet, forming a truncated conical shape. This curved geometry creates a pressure gradient that enhances gas discharge flow rate while maintaining a relatively simple single-piece bracket structure.
2Productivity
If the cross-sectional area of the gas discharge flow path is continuously reduced, then the pressure difference between inlet and outlet is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The flow path cross-sectional area is designed to change continuously along the gas discharge direction, creating an optimized pressure gradient. This parameter variation enhances discharge efficiency while the overall simple bracket structure minimizes manufacturing complexity.
3Productivity
If a venting disk with the same area is used, then the device simplicity is maintained, but the gas discharge flow amount per hour is limited
Solution Approach 1:
By implementing a curved flow path with continuously reducing cross-sectional area, the patent achieves higher gas discharge flow rates per hour with the same venting disk area compared to conventional cylindrical structures, thereby improving productivity without increasing the venting disk area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for a larger gas flow rate per hour even with a venting disk of the same area, improving the safety of battery modules and packs by efficiently discharging generated gas, thereby reducing the risk of explosion or gas introduction into vehicles.
Implementation Method 1
a cross-sectional area of the gas discharge flow path is continuously or gradually reduced in a gas discharge direction... enhancing the pressure difference between the inlet and outlet to increase the discharge flow rate
Implementation Method 2
a venting disk which is fastened to the bracket while in contact with one surface of the bracket to shield the through hole and is configured to rupture when a predetermined pressure is applied
Data Source
AI summary
A gas venting device, has a flow path with a cross sectional area that is continuously reduced in a gas discharge direction. This allows a larger amount of gas to be discharged compared to a venting disk having the same area . The gas venting device can be used with a battery module and a battery pack.